Combined toilet flush valve seat and overflow tube



FIG. 1 is perspective view of the design from above;

FIG. 2 is front view of the design;

FIG. 3 is right side view of the design;

FIG. 4 is left side view of the design;

FIG. 5 is a top view of the design; and,

FIG. 6 is a bottom view of the design. 

The ornamental design for a combined toilet flush valve seat and overflow tube, as shown and described. 